[SY-C13] An Elastic-Viscoplastic Crystal Plasticity Modeling for Plane Strain Deformation of Pure Magnesium
A rate-dependent elastic-viscoplastic constitutive model is proposed. The model of plane deformation of single crystal magnesium is established by considering seven orientations with different loading directions. The basal, prismatic and pyramidal slip systems in the parent grain, compressive twinning (CT) and tensile twinning (TT) are incorporated in the model. The constitutive descriptions of CT and TT are distinguished to better characterize their effects on the overall hardening of magnesium. The contributions of different deformation modes to the macroscopic plastic deformation of magnesium single crystals in the seven cases are presented. These computational predictions are compared with their corresponding macroscopic experimental observations (stress-strain responses) and other numerical results. These results prove that it is necessary to distinguish different twinning systems and their associated hardening laws for the plastic deformation of magnesium and its alloy.